Tuesday, January19, 2021
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Marine Weather and Tides
Sausalito, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:20AMSunset 5:20PM Tuesday January 19, 2021 10:21 AM PST (18:21 UTC) Moonrise 11:18AMMoonset 12:00AM Illumination 38% Phase: Waxing Crescent; Moon at 6 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 817 Am Pst Tue Jan 19 2021
.gale warning in effect until 2 pm pst this afternoon...
Today..NE winds 25 to 35 kt with gusts up to 45 kt. Wind waves 9 to 10 ft, decreasing to 5 to 6 ft this afternoon. W swell 5 to 7 ft at 15 seconds.
Tonight..NE winds 15 to 25 kt with gusts up to 35 kt. Wind waves 4 to 5 ft. W swell 2 to 4 ft at 14 seconds.
Wed..NE winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 2 to 4 ft at 14 seconds.
Wed night..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 2 to 3 ft at 14 seconds.
Thu..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 15 seconds.
Thu night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 3 to 5 ft at 14 seconds.
Fri..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 8 to 10 ft. A slight chance of showers.
Sat..N winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 9 to 11 ft with a dominant period of 16 seconds. Across the bar...seas 11 to 13 ft with a dominant period of 16 seconds. Maximum ebb current of 1.7 kt at 09:31 am Tuesday and 1.5 kt at 09:31 pm Tuesday.
PZZ500 817 Am Pst Tue Jan 19 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gale force gusts over much of the coastal waters and the san francisco bay will continue into this afternoon before winds gradually diminish. Locally breezy winds will persist this afternoon and evening resulting in hazardous seas conditions for smaller vessels. Lighter winds mid-week before a wet weather system arrives at the end of the week and northwest winds increase. Moderate northwest swell will prevail through much of the period.


7 Day Forecast for Marine Location Near Sausalito, CA
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location: 37.8, -122.5     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 191750 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 950 AM PST Tue Jan 19 2021

SYNOPSIS. Gusty offshore winds will continue through midday then slowly subside this afternoon through sunset. High pressure builds Wednesday and Thursday with dry and tranquil weather. A cooling trend by Friday as a trough approaches with a chance of some light rain showers. Drying trend for Saturday with another cold front forecast to arrive later Sunday into early Monday with a better chance of rain. Long range pattern looks cool and wet next week.

DISCUSSION. as of 9:37 AM PST Tuesday . Strong wind event peaked overnight but still seeing gusty winds across the region. Latest obs still showing gusts in excess of 64 mph for the Oakland North wx station at 1400 feet in the East Bay hills with gusts in excess of 50 mph across the North Bay hills. High Wind Warning for the hills currently goes through 10 am. Plan will be to transition that Warning to a Wind Advisory to match the rest of the region that will keep the Wind Advisory in effect through 6 pm this afternoon. Impacts reported have been numerous throughout the region with trees, limbs and powerlines down. Its impacted our radar here with the comms lines down as strong winds pummeled the Santa Cruz mountains. Several small fires have been reported from the North Bay, through the Bay Area and into the Santa Cruz mountains. The 2020 burn areas across Monterey county have put up dust and ash plumes that are visible across the Central Coast and showing up on GOES17 satellite.

The traditional SFO-WMC gradient peaked around 15 mb and is currently around 14 mb. Those values are moderately strong but the upper support and cold advection were ideal for strong sinking air and momentum transfer as the main upper low is now cutting off over SoCal.

Moving forward as winds ease tonight we expect quiet weather to return Weds and Thursday as the upper low wobbles over SoCal and high pressure tries to nose over the Bay Area and Central Coast.

This wind event, though dry has signaled the beginning of an overall pattern change. By Friday a cold upper level shortwave will take aim for NorCal. Much cooler temps will be the main impact along with some scattered rain showers forecast Friday for the Bay Area. Rain amounts look light and spotty at this time. Any rain showers will end early Saturday but expect cool and blustery weather for the weekend.

A second stronger and wetter front is forecast to arrive late Sunday into early Monday. Will start to focus on the long range forecasts over the coming days but all signals suggest a cooler and wetter pattern to wind out the month.

PREV DISCUSSION. as of 03:13 AM PST Tuesday . Strong, damaging winds continue to impact the region this morning with numerous reports of downed trees and limbs, scattered power outages and property damage. Wind gusts of 40 to 60 mph have been reported across portions of the Bay Area with gusts of 75 to 95 mph in the Mayacamas Mountains. Reports in excess of 70 mph have also been reported in the higher peaks of the Diablo Range and Santa Cruz Mountains as well as just above Highway 1 along the Big Sur Coast. Surface pressure gradient from WMC to SFO approached 14 mb around 09Z and may tighten a bit more before sunrise. Additionally, the local WRF and HRRR maintain 925mb winds of 45 to 55 kt over portions of the region through 15Z before diminishing by midday. Thus, will extend the High Wind Warning (for higher elevations about 1,000 feet) until 10 AM PST. Breezy to locally gusty winds will then remain possible over portions of the region through the afternoon as the air mass aloft begins to stabilize. Thus, the Wind Advisory will remain in effect even though winds will gradually diminish region-wide into the afternoon.

Colder air aloft will continue to advect over the region today as the mid/upper level low currently centered over southern Nevada shifts to the southwest and then off of the southern California coast. This will allow for afternoon temperatures to be 10 to 15 deg F cooler compared to yesterday, yet still above seasonal averages due to the dry, offshore flow. The combination of unseasonably dry fuels, strong winds and low humidity will continue to produce critical fire weather conditions over the mountains of Monterey and San Benito Counties where a Red Flag Warning remains in effect through this afternoon. While dry conditions and strong winds are impacting the remainder of the Bay Area as well, that region has seen more rainfall (albeit well below climatological normal) and thus has less of a threat for rapidly spreading wildfires. For more details, see the Fire Weather Discussion below.

Temperatures will remain above seasonal averages into Wednesday as light offshore flow persists. Onshore flow returns on Thursday resulting in a slight cooling trend that will become more robust by Friday as the upper level ridge over the Pacific retrogrades to the west. Cooler, unsettled weather conditions are expected as early as Friday as a mid/upper level low drops southward along the West Coast. Isolated to scattered rain showers will be possible over the region from Friday into Saturday as this colder system lacks sufficient moisture. Subsequent systems, potentially with a better moisture tap, will bring additional chances of precipitation across the region into early next week. Stay tuned as our focus turns to a more unsettled weather pattern late in the week.

AVIATION. as of 09:49 AM PST Tuesday . For the 18Z TAFs. Strong offshore winds persist this morning across the region with airport observations still reporting gusts between 25 and 40 kt. Observations across the hills also still gusting 45 to 60 mph above 1000 ft AGL. Expect LLWS issues to persist into the early afternoon. Will continually monitor observations and extend LLWS in the tafs if necessary. Stronger surface gusts will still be possible into the afternoon as well before gradually diminishing into this evening. Locally reduced vis due to blowing dust may also be an issue. There have still been blowing dust reports in certain areas this morning. Another brief burst of breezy offshore winds between 1,000 and 3,000 feet is expected over the North Bay this evening into tonight with 925 mb winds at about 40 to 50 kt. Otherwise, lighter winds expected overnight and then through the rest of the taf period.

Vicinity of KSFO . VFR. Airport Weather Warning was extended until 19z today as wind gusts at the airport are still blowing above 35 kt. Winds aloft are still elevated as well and therefore LLWS issues may also persist over the next hour or two. Will monitor observations and LLWS may be extended if needed. Surface gusts should gradually diminish throughout the rest of the day though gusts of 25 to 30 kt or so will likely continue into the early evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Satellite showed earlier possible blowing dust from the River Burn Scar, as winds aloft remain gusty locally reduced vis may be possible due to blowing dust. LLWS issue to continue into the early afternoon as winds aloft remain breezy. Will monitor obs and extend LLWS if needed. Surface winds at KMRY and KSNS have been lighter than surrounding areas, though occasional higher gusts may mix down to the surface into the afternoon. Lighter winds this evening and overnight.

FIRE WEATHER. as of 03:13 AM PST Tuesday . A very dry air mass continues to advect over the region this morning with humidity values in the teens across much of the Central Coast. Additionally, strong gusty winds will prevail through the morning before diminishing later this afternoon. These weather conditions combined with unseasonably dry fuels will result in critical fire weather conditions through early this afternoon. Thus, the Red Flag Warning will remain in effect through 3 PM PST for the mountains of Monterey and San Benito Counties. While heightened fire weather conditions will persist over the remainder of the region through this afternoon, early season rains and some "green up" will limit a widespread fire weather threat. Conditions improve region wide Tuesday night into Wednesday as winds diminish and onshore flow returns late in the week.

MARINE. as of 09:05 AM PST Tuesday . Gale force gusts over much of the coastal waters and the San Francisco Bay will continue into this afternoon before winds gradually diminish. Locally breezy winds will persist this afternoon and evening resulting in hazardous seas conditions for smaller vessels. Lighter winds mid- week before a wet weather system arrives at the end of the week and northwest winds increase. Moderate northwest swell will prevail through much of the period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Red Flag Warning . CAZ517-518 Wind Advisory . CAZ006-505-506-508>510-513-518-528>530 High Wind Warning . CAZ507-511-512-517 SCA . Mry Bay until 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM GLW . Pt Arena to Pt Reyes 0-10 nm until 2 PM GLW . Pt Reyes to Pigeon Pt 0-10 nm until 2 PM GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 2 PM GLW . Pt Arena to Pigeon Pt 10-60 nm until 12 PM GLW . SF Bay until 3 PM



PUBLIC FORECAST: RWW AVIATION: AS MARINE: AS FIRE WEATHER: RGass

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi52 min NNE 20 G 27 56°F 52°F1016.3 hPa
PXSC1 5 mi52 min 56°F 35°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 6 mi52 min N 18 G 22 55°F 1015 hPa
46237 - San Francisco Bar, CA (142) 7 mi52 min 52°F7 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi71 min NNW 25 54°F 1015 hPa
OBXC1 8 mi52 min 58°F 20°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 9 mi52 min NNE 16 G 26
OKXC1 - 9414776 - Oakland (Berth 34), CA 9 mi52 min NNE 19 G 28 56°F 1016.2 hPa
RCMC1 - 9414863 - Richmond, CA 10 mi52 min N 24 G 33 56°F 52°F1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 10 mi52 min N 17 G 28 58°F 1016.3 hPa
AAMC1 - 9414750 - Alameda, CA 11 mi52 min NNE 8 G 18 58°F 53°F1016.2 hPa
LNDC1 12 mi52 min NNE 8.9 G 15 58°F 1015.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 18 mi42 min N 23 G 29 52°F1015.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 22 mi52 min NNE 20 G 25 58°F 1015.9 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi52 min N 20 G 29 56°F 55°F1014.4 hPa
UPBC1 26 mi52 min NNE 28 G 34
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi52 min NNE 19 G 24 56°F 52°F1016.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi52 min NNE 26 G 32 54°F 51°F1016.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 36 mi52 min NE 24 G 30 54°F 1016.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 37 mi97 min NE 21 54°F 1016 hPa19°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi42 min N 19 G 23 56°F 1015.3 hPa37°F
BDXC1 47 mi76 min 52°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi26 minNNE 31 G 3710.00 miA Few Clouds and Windy58°F31°F36%1015.1 hPa
Oakland, Metro Oakland International Airport, CA16 mi29 minNNE 21 G 2510.00 miFair and Breezy62°F20°F20%1016.3 hPa
Half Moon Bay Airport, CA20 mi27 minNNE 26 G 389.00 miLight Rain and Windy59°F18°F20%1013.2 hPa
Hayward, Hayward Air Terminal, CA22 mi28 minN 22 G 3210.00 miFair and Breezy58°F18°F21%1016 hPa
San Carlos Airport, CA23 mi95 minN 28 G 3210.00 miClear and Windy54°F28°F38%1014.2 hPa
Novato / Gnoss Field, CA24 mi27 minN 15 G 2610.00 miFair61°F14°F16%1017.3 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrCalmNE4N11N16N12N13N8N11N16N20N21N18N13NW14N26N29
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1 day agoSE4N3E3CalmSE3NW4NW8NW12NW6W3NW3W9W5E3W3NW5W6CalmW3S3NW4S8W3Calm
2 days agoNE5CalmE3NW9NW12NW17W14NW15NW12NW12W8SW3CalmCalmCalmCalmCalmCalmSW4S3NE3CalmS3S5

Tide / Current Tables for San Francisco, California (2) (expired 1998-12-31)
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San Francisco
Click for Map
Tue -- 04:23 AM PST     5.20 feet High Tide
Tue -- 07:22 AM PST     Sunrise
Tue -- 10:24 AM PST     2.31 feet Low Tide
Tue -- 11:17 AM PST     Moonrise
Tue -- 03:53 PM PST     3.93 feet High Tide
Tue -- 05:19 PM PST     Sunset
Tue -- 09:51 PM PST     1.54 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.43.34.14.85.25.14.743.22.62.32.42.73.13.53.83.93.83.32.72.11.71.51.8

Tide / Current Tables for San Francisco Bay Entrance (Golden Gate), California Current
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San Francisco Bay Entrance (Golden Gate)
Click for Map
Tue -- 02:51 AM PST     2.66 knots Max Flood
Tue -- 06:06 AM PST     -0.00 knots Slack
Tue -- 07:22 AM PST     Sunrise
Tue -- 08:43 AM PST     -2.56 knots Max Ebb
Tue -- 11:17 AM PST     Moonrise
Tue -- 12:45 PM PST     0.00 knots Slack
Tue -- 03:20 PM PST     1.77 knots Max Flood
Tue -- 05:19 PM PST     Sunset
Tue -- 06:12 PM PST     -0.00 knots Slack
Tue -- 08:51 PM PST     -2.42 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.21.52.42.72.31.50.2-1.4-2.4-2.5-2.2-1.6-0.80.31.31.71.71.20.2-1-2.1-2.4-2-1.4

Weather Map
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GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.